for ANY restaurant if you show up right when they first open there will be little to no wait to be seated. The entire restaurant is empty and they are not waiting for tables to turn over. They don't totally fill up every section right at opening so the server can handle the few people seated at once, and they space the rest of the arrivals out. It's not until they are waiting for tables to turn over that things start getting backed up.
We always do first seating when we can, I have a child on the spectrum and waiting a long time for a table when he's hungry is a bad combo. We do a lot of early lunches for our main meal or first seating (5-5:30) at signatures for dinners. At 'Ohana we have it as a "sunday dinner" at 3:30 right when they open. Servers are fresh, food is fresh, no wait for anything really. it's a great time to go. I don't care so much what time I eat as long as I space things appropriately.